1911-11-10, Richmond Times-Dispatch; advertisement stating that the bronze tablet that marks the site of Libby Prison has been made by the Richmond Machine Works
From the Richmond Times-Dispatch, 11/10/1911, p. 2, c. 5
BRONZE TABLET COMMEMORATING THE SITE OF LIBBY PRISON MANUFACTURED BY Richmond Machine Works, Inc. Successors to MAYO IRON WORKS, INC. Mad 1186 2404 Main St.